US10425175B2 - Transmission control method and apparatus - Google Patents

Transmission control method and apparatus Download PDF

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Publication number
US10425175B2
US10425175B2 US15/594,321 US201715594321A US10425175B2 US 10425175 B2 US10425175 B2 US 10425175B2 US 201715594321 A US201715594321 A US 201715594321A US 10425175 B2 US10425175 B2 US 10425175B2
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high frequency
downlink data
control information
base station
terminal
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US20170250764A1 (en
Inventor
Fan WEN
Lanjie YUAN
Huang Huang
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/16—Threshold monitoring
    • H04W72/0413—
    • H04W72/042—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a transmission control method and an apparatus.
  • terminals and base stations generally operate at a low frequency.
  • LTE Long Term Evolution
  • both terminals and base stations operate at a low frequency, that is, data is transmitted at a low frequency.
  • a terminal generally sends control information, for example, data retransmission request information, to the base station, and the base station responds to the data retransmission request and determines whether to perform data retransmission.
  • control information for example, data retransmission request information
  • the terminal sends, at a low frequency to the base station, both the control information and data that needs to be transmitted.
  • a base station For data transmission at a low frequency, a data rate is low, beam coverage is wide, and power consumption is low.
  • a data rate For data transmission at a high frequency, a data rate is high, beam coverage is narrow, and power consumption is high.
  • a base station transmits data to a terminal, it is generally required that a higher data transmission rate is better. Therefore, it is put forward in the industry that a base station transmits data to a terminal at a high frequency when the base station transmits the data to the terminal, that is, the base station sends downlink data to the terminal at a high frequency.
  • a transmission time interval (TTI) is relatively long, that is, a feedback time is long. Therefore, the original method can no longer be applied to feed back control information that is used to improve transmission quality of high frequency downlink data.
  • no method for feeding back control information in a timely manner is put forward in the industry in a process in which downlink data is transmitted at a high frequency.
  • Embodiments of the present invention provide a transmission control method and an apparatus, so that a terminal can rapidly feed back control information at a high frequency in a process in which downlink data is transmitted at a high frequency, and a feedback time is short.
  • a first aspect of the present invention provides a transmission control method, including:
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a second aspect of the present invention provides a base station, including:
  • a sending module configured to send downlink data to a terminal at a high frequency when detecting that the downlink data needs to be transmitted at the high frequency.
  • the sending module is specifically configured to: when a downlink data transmission rate exceeds a preset threshold, determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency; or
  • the sending module is specifically configured to: when detecting that transmission of the downlink data at a low frequency is faulty, determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • a third aspect of the present invention provides a terminal, including:
  • a first sending module configured to: when a base station sends downlink data to the terminal at a high frequency, send, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a fourth aspect of the present invention provides a base station, including a transmitter, where
  • the transmitter is configured to send downlink data to a terminal at a high frequency when detecting that the downlink data needs to be transmitted at the high frequency.
  • the transmitter is further configured to: when a downlink data transmission rate exceeds a preset threshold, determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency; or
  • the transmitter is further configured to: when detecting that transmission of the downlink data at a low frequency is faulty, determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • a fifth aspect of the present invention provides a terminal, including a transmitter, where
  • the transmitter is configured to: when a base station sends downlink data to the terminal at a high frequency, send, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a base station when detecting that downlink data needs to be transmitted at a high frequency, a base station sends the downlink data to a terminal at the high frequency, and the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a manner of feeding back the control information at a high frequency is put forward. Because a time interval of the high frequency is relatively short, the control information can be rapidly fed back, suitable for data transmission of high frequency downlink data at a high rate, and reducing a feedback time of the control information.
  • FIG. 1 is a schematic flowchart of a transmission control method according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another transmission control method according to an embodiment of the present invention.
  • FIG. 3 shows an LTE FDD frame format according to an embodiment of the present invention
  • FIG. 4 shows a format of a frame transmitted at a high frequency according to an embodiment of the present invention
  • FIG. 5 shows a table including a detailed description of a control channel according to an embodiment of the present invention
  • FIG. 6 is a diagram of a co-site network architecture of a high frequency and a low frequency according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
  • a transmission control method provided in the embodiments of the present invention may be applied to a co-site network architecture of a high frequency and a low frequency.
  • a base station includes a high frequency antenna and a low frequency antenna
  • a terminal also includes a high frequency antenna and a low frequency antenna, that is, data transmission may be performed at both a high frequency and a low frequency between the base station and the terminal.
  • the high frequency and low frequency are relative concepts herein. For example, E-band microwave and Long Term Evolution (LTE) technologies may be considered as specific embodiments of a high frequency and a low frequency, and scenarios in which two transmission frequencies are both high frequencies or low frequencies may also be considered as specific embodiments of a high frequency and a low frequency.
  • LTE Long Term Evolution
  • a high frequency signal Compared with a low frequency signal, a high frequency signal herein has the following features: a higher data rate, narrower field of beam, a higher frequency, and larger power consumption of data transmission and exchange.
  • a low frequency signal Compared with a high frequency signal, a low frequency signal has the following features: a lower data rate, wider field of beam, a lower frequency, and lower power consumption of data transmission and exchange.
  • a frequency of a radio frequency (RF) antenna When a frequency of a radio frequency (RF) antenna is relatively high, the antenna has a higher data rate. However, the field of beam of the antenna is narrower, and an antenna array needs to be used. If the high frequency is applied to uplink data transmission of a terminal, transmission quality is limited by many factors such as impact of a position of the terminal and high transmit power of the terminal. Therefore, a low frequency is generally applied to uplink data transmission of a terminal. When a frequency of an RF antenna is relatively high, the RF antenna may be applied to downlink data transmission of a base station, and have a higher data transmission rate. Therefore, both a high frequency and a low frequency may be applied to downlink data transmission of a base station.
  • RF radio frequency
  • a terminal side needs to feed back some control information to a base station (BS) side to assist downlink data transmission.
  • BS base station
  • Relatively mature technical solutions have been developed to feed back control information in a process in which downlink data is transmitted at a low frequency.
  • a terminal supporting a signal frequency band operates at a low frequency, and transmits both control information and uplink data to a base station at a low frequency.
  • the second and the third subframes in an LTE TDD frame format may be used to transmit control information and uplink data.
  • a terminal needs to rapidly feed back control information by using low power.
  • a low frequency is used to feed back control information.
  • TTI transmission time interval
  • a low frequency is no longer suitable for feeding back control information when downlink data is transmitted at a high frequency.
  • the terminal is not suitable for transmitting uplink data and control information simultaneously either.
  • control information used for assisting in improving transmission quality of the high frequency downlink data is transmitted at a high frequency, and uplink data used for responding to the high frequency downlink data is transmitted at a low frequency, to ensure lower transmit power of a terminal, and ensure that the control information can be rapidly fed back.
  • FIG. 1 is a schematic flowchart of a transmission control method according to an embodiment of the present invention. As shown in the figure, the transmission control method provided in this embodiment includes steps S 100 and S 101 .
  • a base station sends downlink data to a terminal at a high frequency when detecting that the downlink data needs to be transmitted at the high frequency.
  • the method in this embodiment is applied to a co-site network architecture of a high frequency and a low frequency.
  • the terminal includes a high frequency antenna and a low frequency antenna
  • the base station includes a high frequency antenna and a low frequency antenna.
  • the base station sends the downlink data to the terminal at the high frequency.
  • the terminal establishes a high frequency link with the base station by using the high frequency antenna, and a downlink of the high frequency link is used to transmit high frequency downlink data between the base station and the terminal.
  • the high frequency link may be a TDD high frequency channel
  • the downlink of the high frequency link may be a downlink timeslot of the TDD high frequency channel.
  • the TDD downlink timeslot of the high frequency channel transmits the downlink data from the base station to the terminal.
  • detection manners of detecting that the downlink data needs to be transmitted at the high frequency may include the following two optional implementation manners.
  • the base station determines that the downlink data needs to be transmitted at the high frequency, and sends the downlink data to the terminal at the high frequency.
  • that the downlink data needs to be transmitted at the high frequency may be triggered by a trigger condition that the downlink data transmission rate is relatively high and exceeds the preset threshold.
  • the base station may determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • the base station when detecting that transmission of the downlink data at a low frequency is faulty, determines that the downlink data needs to be transmitted at the high frequency, and sends the downlink data to the terminal at the high frequency.
  • that the downlink data needs to be transmitted at the high frequency may also be triggered by a trigger condition that transmission of the downlink data at a low frequency is faulty, for example, transmission is unstable when the downlink data is transmitted at a low frequency, or data is retransmitted many times when the downlink data is transmitted at a low frequency or the like.
  • the base station may determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • the terminal needs to feed back, to the base station, the control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station adjusts the transmission process of the high frequency downlink data according to the control information.
  • a feedback time for feeding back the control information mainly depends on a TTI timeslot length in a format of a transmitted frame.
  • a TTI timeslot length of the low frequency is different from that of the high frequency.
  • FIG. 3 shows an LTE frequency division duplex (FDD) frame format.
  • FDD frequency division duplex
  • a length of one subframe in the FDD frame format defined in LTE is 1 ms, and is one TTI timeslot length in LTE.
  • FIG. 4 shows a typical format of a frame transmitted at a high frequency.
  • One timeslot length obtained by division in the format of a high frequency frame is 0.125 ms, and is one TTI timeslot length. It may be learned that, as the RF frequency is higher, the TTI timeslot length is shorter, and on the contrary, as the RF frequency is lower, the TTI timeslot length is longer.
  • this embodiment of the present invention provides a solution in which the control information used for assisting the base station in improving transmission quality of the high frequency downlink data is sent to the base station at the high frequency.
  • the control information may be transmitted by means of an uplink timeslot on a high frequency channel.
  • the uplink timeslot on the high frequency channel may be referred to as a control channel, and the control information used for assisting the base station in improving transmission quality of the high frequency downlink data is transmitted on the control channel.
  • control information may include synchronization control information and user control information.
  • the synchronization control information is transmitted on a physical random access channel (PRACH) of the control channel.
  • the synchronization control information may include Preamble detection information and an uplink synchronization code SYNC-UL.
  • the user control information is transmitted on a physical uplink control channel (PUCCH).
  • the user control information may include a channel estimation sequence of channel state information (CSI), a channel quality indicator (CQI), an acknowledgement (ACK) or a negative acknowledgement (NACK), a beam ID, a scheduling request, and the like. It should be noted that control information that is actually fed back may also be one or more of the foregoing control information.
  • the base station responds to the different control information in different manners. For example, when the BS side responds to the ACK/NACK indication, the BS side provides a response and implements data retransmission if the NACK is valid. Otherwise, the BS side does not perform data retransmission.
  • the terminal sends the channel estimation sequence at a high frequency. The BS side performs channel estimation by using the channel estimation sequence, and transmits the downlink data at the high frequency by directly using a result of the channel estimation.
  • the above describes a procedure in which only the control information is transmitted in an uplink timeslot of the TDD high frequency channel. If there are N (N is greater than or equal to 2) high frequency channels that have different frequencies and whose synchronization has been implemented, in the technical solution in the present invention, the control information can be fed back on an FDD high frequency channel. Because there is no channel reciprocity in FDD, it is unnecessary to transmit the channel estimation sequence of the CSI in the control information fed back on an FDD uplink, and instead, the terminal needs to feed back an estimation result of a downlink timeslot on the high frequency channel.
  • a manner of sending, by the terminal, the control information to the base station at the high frequency may include steps S 10 to S 13 .
  • the terminal generates a control signal according to the high frequency downlink data, where the control signal includes the control information used for assisting the base station in improving transmission quality of the high frequency downlink data.
  • the terminal modulates the control signal by using a lower order modulation mode to obtain a modulated signal including the control information.
  • the terminal to reduce transmit power of the terminal and implement low signal-to-noise ratio communication, the terminal modulates the control signal including the control information by using the low-frequency modulation mode.
  • the low-frequency modulation mode may be that the terminal modulates the control signal by using a single carrier or multiple carriers to obtain the modulated signal including the control information.
  • S 12 The terminal processes, based on a spread spectrum communications technology, the modulated signal to obtain a sending signal including the control information.
  • the terminal sends, to the base station at the high frequency, the sending signal including the control information.
  • a base station when detecting that downlink data needs to be transmitted at a high frequency, a base station sends the downlink data to a terminal at the high frequency, and the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a manner of feeding back the control information at a high frequency is put forward. Because a time interval of the high frequency is relatively short, the control information can be rapidly fed back, suitable for data transmission of high frequency downlink data at a high rate, and reducing a feedback time of the control information.
  • FIG. 2 is a schematic flowchart of another transmission control method according to an embodiment of the present invention. As shown in the figure, the transmission control method provided in this embodiment includes steps S 200 to S 203 .
  • a base station sends downlink data to a terminal at a high frequency when detecting that the downlink data needs to be transmitted at the high frequency.
  • step S 200 in this embodiment of the present invention refers to step S 100 in the embodiment of FIG. 1 . Details are not described herein again.
  • the terminal determines to establish high frequency synchronization by detecting a primary synchronization code of a physical shared channel and a secondary synchronization code of a secondary synchronization channel.
  • the terminal before transmitting control information at a high frequency, the terminal needs to determine to establish high frequency synchronization by detecting the primary synchronization code (PSC) of the physical shared channel (PSCH) and a secondary synchronization code (SSC) of the secondary synchronization channel (SSCH).
  • PSC primary synchronization code
  • SSC secondary synchronization code
  • the terminal sends, to the base station at a synchronized high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data.
  • S 203 The terminal sends, to the base station at a low frequency, low frequency uplink data used for responding to the high frequency downlink data.
  • the base station may send data to the terminal at a low frequency or at a high frequency.
  • the terminal sends, to the base station at a high frequency, control information used for improving transmission quality of the high frequency downlink data.
  • the terminal sends, to the base station at a low frequency, low frequency uplink data used for responding to the high frequency downlink data. That is, the terminal sends only the control information at a high frequency, and all uplink data used for responding to the high frequency downlink data is sent at a low frequency, to achieve low transmit power of the terminal.
  • a base station when detecting that downlink data needs to be transmitted at a high frequency, a base station sends the downlink data to a terminal at the high frequency, and the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a manner of feeding back the control information at a high frequency is put forward. Because a time interval of the high frequency is relatively short, the control information can be rapidly fed back, suitable for data transmission of high frequency downlink data at a high rate, and reducing a feedback time of the control information.
  • FIG. 6 shows a co-site network architecture of a high frequency and a low frequency according to an embodiment of the present invention.
  • the method in the foregoing embodiment can be applied to the network architecture.
  • the network architecture includes a terminal and a base station.
  • the terminal includes a high frequency antenna and a low frequency antenna
  • the base station also includes a high frequency antenna and a low frequency antenna. Both high frequency data transmission and low frequency data transmission can be performed between the base station and the terminal.
  • the base station may send downlink data to the terminal at a low frequency or at a high frequency.
  • the terminal side needs to feed back some control information to the BS side to assist downlink data transmission.
  • Relatively mature technical solutions have been developed to feed back control information used for assisting in improving transmission quality of the low frequency downlink data during transmission of the low frequency downlink data.
  • a terminal supporting a signal frequency band operates at a low frequency, and transmits both control information and uplink data at a low frequency.
  • the second and the third subframes in an LTE TDD frame format are used to transmit control information and uplink data.
  • the terminal needs to rapidly feed back, by using low power, control information used for assisting in improving transmission quality of the high frequency downlink data.
  • a low frequency is used to feed back control information. Because a transmission time interval (TTI) of a format of a frame transmitted at a low frequency is relatively long, that is, a feedback time is long, the low frequency is no longer suitable for feeding back control information when downlink data is transmitted at a high frequency.
  • TTI transmission time interval
  • a high frequency is not suitable for transmitting uplink data used for responding to downlink data and control information simultaneously either.
  • a base station when detecting that downlink data needs to be transmitted at a high frequency, a base station sends the downlink data to a terminal at the high frequency, and the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a manner of feeding back the control information at a high frequency is put forward. Because a time interval of the high frequency is relatively short, the control information can be rapidly fed back, suitable for data transmission of high frequency downlink data at a high rate, and reducing a feedback time of the control information.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the base station in this embodiment may include a sending module 100 .
  • the sending module 100 is configured to send downlink data to a terminal at a high frequency when detecting that the downlink data needs to be transmitted at the high frequency.
  • the sending module 100 is specifically configured to: when a downlink data transmission rate exceeds a preset threshold, determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency; or
  • the sending module is specifically configured to: when detecting that transmission of the downlink data at a low frequency is faulty, determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • that the downlink data needs to be transmitted at the high frequency may be triggered by a trigger condition that the downlink data transmission rate is relatively high and exceeds the preset threshold. A rate at which the downlink data is transmitted at a low frequency cannot satisfy the relatively high downlink data transmission rate.
  • the sending module 100 may determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • That the downlink data needs to be transmitted at the high frequency may also be triggered by a trigger condition that transmission of the downlink data at a low frequency is faulty, for example, transmission is unstable when the downlink data is transmitted at a low frequency, or data is retransmitted many times when the downlink data is transmitted at a low frequency or the like.
  • the sending module 100 may determine that the downlink data needs to be transmitted at the high frequency, and the sending module 100 in the base station sends the downlink data to the terminal at the high frequency.
  • a base station when detecting that downlink data needs to be transmitted at a high frequency, a base station sends the downlink data to a terminal at the high frequency, and the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a manner of feeding back the control information at a high frequency is put forward. Because a time interval of the high frequency is relatively short, the control information can be rapidly fed back, suitable for data transmission of high frequency downlink data at a high rate, and reducing a feedback time of the control information.
  • FIG. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the terminal in this embodiment may include a first sending module 200 .
  • the first sending module 200 is configured to: when a base station sends downlink data to the terminal at a high frequency, send, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • the first sending module 200 in the terminal needs to feed back, to the base station, the control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station adjusts the transmission process of the high frequency downlink data according to the control information.
  • a feedback time for feeding back the control information mainly depends on a TTI timeslot length in a format of a transmitted frame.
  • a TTI timeslot length of the low frequency is different from that of the high frequency.
  • FIG. 3 shows an LTE frequency division duplex (FDD) frame format.
  • FDD frequency division duplex
  • a length of one subframe in the FDD frame format defined in LTE is 1 ms, and is one TTI timeslot length in LTE.
  • FIG. 4 shows a typical format of a frame transmitted at a high frequency.
  • One timeslot length obtained by division in the format of a high frequency frame is 0.125 ms, and is one TTI timeslot length. It may be learned that, as the RF frequency is higher, the TTI timeslot length is shorter, and on the contrary, as the RF frequency is lower, the TTI timeslot length is longer.
  • this embodiment of the present invention provides a solution in which the control information used for assisting the base station in improving transmission quality of the high frequency downlink data is sent to the base station at the high frequency.
  • the control information may be transmitted by means of an uplink timeslot on a high frequency channel.
  • the uplink timeslot on the high frequency channel may be referred to as a control channel, and the control information used for assisting the base station in improving transmission quality of the high frequency downlink data is transmitted on the control channel.
  • control information may include synchronization control information and user control information.
  • the synchronization control information is transmitted on a physical random access channel (PRACH) of the control channel.
  • the synchronization control information may include Preamble detection information and an uplink synchronization code SYNC-UL.
  • the user control information is transmitted on a physical uplink control channel (PUCCH).
  • the user control information may include a channel estimation sequence of channel state information (CSI), a channel quality indicator (CQI), an acknowledgement (ACK) or a negative acknowledgement (NACK), a beam ID, a scheduling request, and the like. It should be noted that control information that is actually fed back may also be one or more of the foregoing control information.
  • the base station responds to the different control information in different manners. For example, when the BS side responds to the ACK/NACK indication, the BS side provides a response and implements data retransmission if the NACK is valid. Otherwise, the BS side does not perform data retransmission.
  • the terminal sends the channel estimation sequence at a high frequency. The BS side performs channel estimation by using the channel estimation sequence, and transmits the downlink data at the high frequency by directly using a result of the channel estimation.
  • the above describes a procedure in which only the control information is transmitted in an uplink timeslot of the TDD high frequency channel. If there are N (N is greater than or equal to 2) high frequency channels that have different frequencies and whose synchronization has been implemented, in the technical solution in the present invention, the control information can be fed back on an FDD high frequency channel. Because there is no channel reciprocity in FDD, it is unnecessary to transmit the channel estimation sequence of the CSI in the control information fed back on an FDD uplink, and instead, the terminal needs to feed back an estimation result of a downlink timeslot on the high frequency channel.
  • the first sending module 200 may include a generation unit, a modulation unit, a processing unit, and a sending unit, where
  • the generation unit is configured to generate a control signal according to the high frequency downlink data, where the control signal includes the control information used for assisting the base station in improving transmission quality of the high frequency downlink data;
  • the modulation unit is configured to modulate the control signal by using a lower order modulation mode to obtain a modulated signal including the control information;
  • the modulation unit is specifically configured to modulate the control signal by using a single carrier or multiple carriers to obtain the modulated signal including the control information;
  • the processing unit is configured to process, based on a spread spectrum communications technology, the modulated signal to obtain a sending signal including the control information;
  • the sending unit is configured to send, to the base station at the high frequency, the sending signal including the control information.
  • the terminal may further include a second sending module 201 , where
  • the second sending module 201 is configured to send, to the base station at a low frequency, low frequency uplink data used for responding to the high frequency downlink data.
  • the base station may send data to the terminal at a low frequency or at a high frequency.
  • the terminal sends, to the base station at a high frequency, control information used for improving transmission quality of the high frequency downlink data.
  • the second sending module 201 in the terminal sends, to the base station at a low frequency, low frequency uplink data used for responding to the high frequency downlink data. That is, the terminal sends only the control information at a high frequency, and all uplink data used for responding to the high frequency downlink data is sent at a low frequency, to achieve low transmit power of the terminal.
  • the terminal further includes a synchronization module 202 , where
  • the synchronization module 202 is configured to determine to establish high frequency synchronization by detecting a primary synchronization code of a physical shared channel and a secondary synchronization code of a secondary synchronization channel;
  • the synchronization module 202 in the terminal needs to determine to establish high frequency synchronization by detecting the primary synchronization code (PSC) of the physical shared channel (PSCH) and a secondary synchronization code (SSC) of the secondary synchronization channel (SSCH).
  • PSC primary synchronization code
  • SSC secondary synchronization code
  • the first sending module 200 is specifically configured to send, to the base station at a synchronized high frequency, the control information used for assisting the base station in improving transmission quality of the high frequency downlink data.
  • a base station when detecting that downlink data needs to be transmitted at a high frequency, a base station sends the downlink data to a terminal at the high frequency, and the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a manner of feeding back the control information at a high frequency is put forward. Because a time interval of the high frequency is relatively short, the control information can be rapidly fed back, suitable for data transmission of high frequency downlink data at a high rate, and reducing a feedback time of the control information.
  • FIG. 9 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • the base station in this embodiment includes a processor 300 , a transmitter 301 , and a memory 302 .
  • the memory 302 is configured to store program code;
  • the processor 300 is configured to call the program code in the memory 302 to execute a corresponding operation; and
  • the processor 300 , the transmitter 301 , and the memory 302 are connected to a bus, and communicate with each other by means of the bus.
  • the transmitter is configured to send downlink data to a terminal at a high frequency when detecting that the downlink data needs to be transmitted at the high frequency.
  • the method in this embodiment is applied to a co-site network architecture of a high frequency and a low frequency.
  • the terminal includes a high frequency antenna and a low frequency antenna
  • the base station includes a high frequency antenna and a low frequency antenna.
  • the base station sends the downlink data to the terminal at the high frequency.
  • the terminal establishes a high frequency link with the base station by using the high frequency antenna, and a downlink of the high frequency link is used to transmit high frequency downlink data between the base station and the terminal.
  • the high frequency link may be a TDD high frequency channel
  • the downlink of the high frequency link may be a downlink timeslot of the TDD high frequency channel.
  • the TDD downlink timeslot of the high frequency channel transmits the downlink data from the base station to the terminal.
  • the transmitter is further configured to: when a downlink data transmission rate exceeds a preset threshold, determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency; or
  • the transmitter is further configured to: when detecting that transmission of the downlink data at a low frequency is faulty, determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • that the downlink data needs to be transmitted at the high frequency may be triggered by a trigger condition that the downlink data transmission rate is relatively high and exceeds the preset threshold.
  • the base station may determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • that the downlink data needs to be transmitted at the high frequency may also be triggered by a trigger condition that transmission of the downlink data at a low frequency is faulty, for example, transmission is unstable when the downlink data is transmitted at a low frequency, or data is retransmitted many times when the downlink data is transmitted at a low frequency or the like.
  • the base station may determine that the downlink data needs to be transmitted at the high frequency, and send the downlink data to the terminal at the high frequency.
  • a base station when detecting that downlink data needs to be transmitted at a high frequency, a base station sends the downlink data to a terminal at the high frequency, and the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a manner of feeding back the control information at a high frequency is put forward. Because a time interval of the high frequency is relatively short, the control information can be rapidly fed back, suitable for data transmission of high frequency downlink data at a high rate, and reducing a feedback time of the control information.
  • FIG. 10 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
  • the terminal in this embodiment includes a processor 400 , a transmitter 401 , and a memory 402 .
  • the memory 402 is configured to store program code;
  • the processor 400 is configured to call the program code in the memory 402 to execute a corresponding operation; and
  • the processor 400 , the transmitter 401 , and the memory 402 are connected to a bus, and communicate with each other by means of the bus.
  • the transmitter is configured to: when a base station sends downlink data to the terminal at a high frequency, send, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • the terminal needs to feed back, to the base station, the control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station adjusts the transmission process of the high frequency downlink data according to the control information.
  • a feedback time for feeding back the control information mainly depends on a TTI timeslot length in a format of a transmitted frame.
  • a TTI timeslot length of the low frequency is different from that of the high frequency.
  • FIG. 3 shows an LTE frequency division duplex (FDD) frame format. It is learned from the figure that a length of one subframe in the FDD frame format defined in LTE is 1 ms, and is one TTI timeslot length in LTE.
  • FDD frequency division duplex
  • FIG. 4 shows a typical format of a frame transmitted at a high frequency.
  • One timeslot length obtained by division in the format of a high frequency frame is 0.125 ms, and is one TTI timeslot length. It may be learned that, as the RF frequency is higher, the TTI timeslot length is shorter, and on the contrary, as the RF frequency is lower, the TTI timeslot length is longer.
  • this embodiment of the present invention provides a solution in which the control information used for assisting the base station in improving transmission quality of the high frequency downlink data is sent to the base station at the high frequency.
  • the control information may be transmitted by means of an uplink timeslot on a high frequency channel.
  • the uplink timeslot on the high frequency channel may be referred to as a control channel, and the control information used for assisting the base station in improving transmission quality of the high frequency downlink data is transmitted on the control channel.
  • control information may include synchronization control information and user control information.
  • the synchronization control information is transmitted on a physical random access channel (PRACH) of the control channel.
  • the synchronization control information may include Preamble detection information and an uplink synchronization code SYNC-UL.
  • the user control information is transmitted on a physical uplink control channel (PUCCH).
  • the user control information may include a channel estimation sequence of channel state information (CSI), a channel quality indicator (CQI), an acknowledgement (ACK) or a negative acknowledgement (NACK), a beam ID, a scheduling request, and the like. It should be noted that control information that is actually fed back may also be one or more of the foregoing control information.
  • the base station responds to the different control information in different manners. For example, when the BS side responds to the ACK/NACK indication, the BS side provides a response and implements data retransmission if the NACK is valid. Otherwise, the BS side does not perform data retransmission.
  • the terminal sends the channel estimation sequence at a high frequency. The BS side performs channel estimation by using the channel estimation sequence, and transmits the downlink data at the high frequency by directly using a result of the channel estimation.
  • the above describes a procedure in which only the control information is transmitted in an uplink timeslot of the TDD high frequency channel. If there are N (N is greater than or equal to 2) high frequency channels that have different frequencies and whose synchronization has been implemented, in the technical solution in the present invention, the control information can be fed back on an FDD high frequency channel. Because there is no channel reciprocity in FDD, it is unnecessary to transmit the channel estimation sequence of the CSI in the control information fed back on an FDD uplink, and instead, the terminal needs to feed back an estimation result of a downlink timeslot on the high frequency channel.
  • the transmitter is further configured to send, to the base station at a low frequency, low frequency uplink data used for responding to the high frequency downlink data.
  • the base station may send data to the terminal at a low frequency or at a high frequency.
  • the terminal sends, to the base station at a high frequency, control information used for improving transmission quality of the high frequency downlink data.
  • the terminal sends, to the base station at a low frequency, low frequency uplink data used for responding to the high frequency downlink data. That is, the terminal sends only the control information at a high frequency, and all uplink data used for responding to the high frequency downlink data is sent at a low frequency, to achieve low transmit power of the terminal.
  • the processor is further configured to generate a control signal according to the high frequency downlink data, where the control signal includes the control information used for assisting the base station in improving transmission quality of the high frequency downlink data.
  • the processor is further configured to modulate the control signal by using a lower order modulation mode to obtain a modulated signal including the control information.
  • the processor is further configured to process, based on a spread spectrum communications technology, the modulated signal to obtain a sending signal including the control information.
  • the transmitter is further configured to send, to the base station at the high frequency, the sending signal including the control information.
  • the terminal modulates the control signal including the control information by using the low-frequency modulation mode.
  • the processor is further configured to modulate the control signal by using a single carrier or multiple carriers to obtain the modulated signal including the control information.
  • the processor is further configured to determine to establish high frequency synchronization by detecting a primary synchronization code of a physical shared channel and a secondary synchronization code of a secondary synchronization channel.
  • the transmitter is further configured to send, to the base station at a synchronized high frequency, the control information used for assisting the base station in improving transmission quality of the high frequency downlink data.
  • the terminal before transmitting control information on an uplink of a high frequency link, the terminal needs to determine to establish high frequency synchronization by detecting the primary synchronization code (PSC) of the physical shared channel (PSCH) and a secondary synchronization code (SSC) of the secondary synchronization channel (SSCH).
  • PSC primary synchronization code
  • SSC secondary synchronization code
  • a base station when detecting that downlink data needs to be transmitted at a high frequency, a base station sends the downlink data to a terminal at the high frequency, and the terminal sends, to the base station at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information.
  • a manner of feeding back the control information at a high frequency is put forward. Because a time interval of the high frequency is relatively short, the control information can be rapidly fed back, suitable for data transmission of high frequency downlink data at a high rate, and reducing a feedback time of the control information.
  • a person of ordinary skill in the art may understand that all or some of the processes of the methods in the embodiments may be implemented by a computer program instructing relevant hardware.
  • the program may be stored in a computer readable storage medium. When the program runs, the processes of the methods in the embodiments are performed.
  • the foregoing storage medium may include: a magnetic disk, an optical disc, a read-only memory (ROM), or a random access memory (RAM).

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CN110913491B (zh) * 2019-12-17 2023-07-18 惠州Tcl移动通信有限公司 信道分配方法、装置及存储介质
CN111526607B (zh) * 2020-04-14 2022-07-08 北京小米移动软件有限公司 通信数据的处理方法及装置、终端设备和存储介质
CN114710812B (zh) * 2021-12-27 2023-11-28 荣耀终端有限公司 通信方法和通信装置

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EP3197073B1 (de) 2021-07-14

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